@justifun it's not only about masking effect, i was looking a solution to create a scroller for sprite background, the problem is when the icons move to down, the icons are still visible outside of sprite background

I think that the best option is to use the draggable behavior on the pink sprite and in the IS DRAGGING event SET x = your pos,(otherwise it will be draggable on the X axis as well) in order to keep it feel like a scroll bar and do the deltha thing